Excessive Heat Warning includes Mariposa and Oakhurst

August 14, 2020 - The National Weather Service Hanford Office reports an Excessive Heat Warning is in effect for the San Joaquin Valley, West Side Hills, and Sierra Nevada foothills is from Friday afternoon until Wednesday evening.

An Excessive Heat Warning means that a prolonged period of dangerously hot temperatures is expected.

Heat related illnesses, such as heat exhaustion and heat stroke will be possible. Drink plenty of fluids, stay out of the sun, and remain in an air-conditioned room.

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  Area Forecast Discussion 
  National Weather Service Hanford CA 
  402 AM PDT Fri Aug 14 2020 
   
   
  .SYNOPSIS...Dangerously hot temperatures are expected for the  
  weekend and into the majority of next week as a high pressure  
  strengthens over the Great Basin. Afternoon t-storms are also  
  possible for the higher elevations of the Sierra each day through  
  at least Tuesday.  
   
   
  && 
   
  .DISCUSSION...Current temperatures across the valley are 5 to 10 
  degrees warmer compared to this time yesterday. This is due to a  
  fair amount of mid and upper level cloud cover from the remnants  
  of Elida pushing northward through the district. Clouds will  
  continue to dissipate this morning as our high temperatures begin 
  to really ramp up this afternoon. With ample mid-level moisture  
  and steep mid level lapse rates, there is a slight chance of  
  afternoon showers and t-storms across the higher elevations of the 
  Sierra.  
   
  The major story for our area starting today and going into a  
  majority of next week will be dangerous heat across the central  
  California interior. Deterministic models, as well as their  
  respective ensemble solutions are all indicating that a very  
  strong high pressure will remain situated over the central Great  
  Basin through next week, with only some minor weakening by  
  next Thursday and Friday. Afternoon high temperatures from today  
  through next Friday will range from 102 to 112 in the Southern San 
  Joaquin Valley, West Side Hills, lower elevations of the Sierra  
  foothills, and Kern County desert. Afternoon temperatures up to  
  115 degrees are conceivable each day in the Indian Wells Valley.  
  Low temperatures will also remain very warm during this period,  
  with overnight readings in the 70s and low 80s in warmer  
  locations. For this reason, an Excessive Heat Warning will be in 
  effect from this afternoon through at least next Wednesday. Models 
  are also indicating that mid-level moisture will continue to  
  rotate northward around the periphery of the high pressure.  
  Combined with mid-level instability will lead to a daily chance of 
  afternoon t-storms for the higher elevations of the Southern  
  Sierra through at least Tuesday.  

Source: NWS